Group procedures for machine type communication devices

ABSTRACT

Systems, methods, and instrumentalities to optimize procedures relating to machine type communication devices. Individual UEs may be grouped together in order to optimize procedures relating to members of the group. For example, a group of UE devices may be predefined or a group may be configured by a network associated with the UEs. One or more of the members of the group may be designated as a special UE or a master UE. The special UE or master UE may perform an action on behalf of one or more members of the group.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the 35 U.S.C. §371 National Stage of PatentCooperation Treaty Application No. PCT/US2011/030897, filed Apr. 1,2011, which claims priority to, U.S. Provisional Patent Application No.61/320,376, filed on Apr. 2, 2010, the contents of which are herebyincorporated by reference in its entirety.

BACKGROUND

Machine type communication (MTC) is a form of data communication whichmay involve one or more devices or entities that do not necessarily needhuman interaction in order to communicate. Respective communicationnetworks may include any number of MTC capable devices. Metering devicesor tracking devices are typical examples of MTC devices. As used herein,the term user equipment (UE) may include MTC devices.

Capabilities of MTC devices may vary, and the capabilities of the MTCdevices may depend on the requirements of one or more MTC applications.Categories of features of machine type communications may include one ormore of: Time Controlled, Time Tolerant, Packet Switched (PS) Only,Online Small Data Transmissions, Offline Small Data Transmissions,Mobile Originated Only, Infrequent Mobile Terminated, MTC Monitoring,Offline Indication, Jamming Indication, Priority Alarm Message (PAM),Extra Low Power Consumption, Secure Connection, Location SpecificTrigger and Group Based MTC Features including Group Based Policing andGroup Based Addressing.

The number of MTC devices in use may grow quickly, for example, withdeployment of M2M. Current procedures designed for user equipment (UE)may not be optimized for groups of UEs. For example, redundant locationinformation may be sent by each UE in a group to the network leading toa high signaling load and to unnecessary UE battery consumption. In somescenarios UEs may be moving together or co-exist together as a group, inwhich case the triggering of certain procedures, such as mobility,including cell updates and location registration (or RA/TA) updates, orRRC establishment, may cause unnecessary excessive signaling andoverloading of the air interface and the network itself.

SUMMARY

Systems, methods, and instrumentalities are disclosed to optimizeprocedures relating to machine type communication devices. IndividualUEs may be grouped together. For example, a group of UE devices may bepredefined or a group may be configured by a network associated with theUEs. One or more of the members of the group may be designated asspecial UEs or a master UEs. A master UE may be able to communicate withother members of the group. A special UE or master UE may perform anaction on behalf of one or more members of the group. Group mobilityprocedures may be optimized by having the procedures controlled by aspecial UE or master UE. Procedures that may be performed by a specialUE or master UE may include one or more of: measurements, handover, cellselection/reselection, as well as other group procedures likeregistration and connection establishment in idle mode and connectedmode.

A special UE or master UE may perform cell reselection measurements andcell reselection on behalf of the group. The special UE or master UE maysend a cell update to a network indicating the cell reselection. Thenetwork may communicate the cell reselection to the members of the group(e.g., to notify the members of the group to change cells). That is, thecell update may act as a trigger to the network to communicate the cellreselection to the members of the group. The master UE may communicatethe cell reselection directly to the members of the group.

UEs of the group (i.e., members of the group) may detect the presence ofmaster equipment (e.g., master UE) and choose to connect to the masterUE. The connection may be established by a member registering with themaster UE.

The methods disclosed herein may provide one or more of the followingoptimizations: optimization of mobility procedures for MTC devicesmoving as a group to limit UE battery consumption, limiting thesignaling load generated by the mobility procedures for MTC devicesmoving as a group, limiting the simultaneous signaling for MTC devicesmoving as a group and other group procedure optimizations likeregistration and connection establishment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a system diagram of an example communications system in whichone or more disclosed embodiments may be implemented.

FIG. 1B is a system diagram of an example wireless transmit/receive unit(WTRU) that may be used within the communications system illustrated inFIG. 1A.

FIG. 1C is a system diagram of an example radio access network and anexample core network that may be used within the communications systemillustrated in FIG. 1A.

FIG. 2 illustrates a system with exemplary uses of master equipment tocontrol and/or communicate with a network and one or more UEs in agroup.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

FIGS. 1A, 1B, 1C, and 2 may relate to exemplary embodiments in which thedisclosed systems, methods and instrumentalities may be implemented.However, while the present invention may be described in connection withexemplary embodiments, it is not limited thereto and it is to beunderstood that other embodiments may be used or modifications andadditions may be made to the described embodiments for performing thesame function of the present invention without deviating therefrom.Further, the figures may illustrate call flows, which are meant to beexemplary. It is to be understood that other embodiments may be used.Further, the order of the flows may be varied where appropriate. Inaddition, flows may be omitted if not needed and additional flows may beadded.

Although described within the context of 3GPP UMTS and LTE wirelesscommunications systems, the methods disclosed herein may be applied toany other wireless technology, including, but not limited to, GERAN,LTE-A and WiMax.

FIG. 1A is a diagram of an example communications system 100 in whichone or more disclosed embodiments may be implemented. The communicationssystem 100 may be a multiple access system that provides content, suchas voice, data, video, messaging, broadcast, etc., to multiple wirelessusers. The communications system 100 may enable multiple wireless usersto access such content through the sharing of system resources,including wireless bandwidth. For example, the communications systems100 may employ one or more channel access methods, such as code divisionmultiple access (CDMA), time division multiple access (TDMA), frequencydivision multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrierFDMA (SC-FDMA), and the like.

As shown in FIG. 1A, the communications system 100 may include wirelesstransmit/receive units (WTRUs) 102 a, 102 b, 102 c, 102 d, a radioaccess network (RAN) 104, a core network 106, a public switchedtelephone network (PSTN) 108, the Internet 110, and other networks 112,though it will be appreciated that the disclosed embodiments contemplateany number of WTRUs, base stations, networks, and/or network elements.Each of the WTRUs 102 a, 102 b, 102 c, 102 d may be any type of deviceconfigured to operate and/or communicate in a wireless environment. Byway of example, the WTRUs 102 a, 102 b, 102 c, 102 d may be configuredto transmit and/or receive wireless signals and may include userequipment (UE), a mobile station, a fixed or mobile subscriber unit, apager, a cellular telephone, a personal digital assistant (PDA), asmartphone, a laptop, a netbook, a personal computer, a wireless sensor,consumer electronics, and the like.

The communications systems 100 may also include a base station 114 a anda base station 114 b. Each of the base stations 114 a, 114 b may be anytype of device configured to wirelessly interface with at least one ofthe WTRUs 102 a, 102 b, 102 c, 102 d to facilitate access to one or morecommunication networks, such as the core network 106, the Internet 110,and/or the networks 112. By way of example, the base stations 114 a, 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a HomeNode B, a Home eNode B, a site controller, an access point (AP), awireless router, and the like. While the base stations 114 a, 114 b areeach depicted as a single element, it will be appreciated that the basestations 114 a, 114 b may include any number of interconnected basestations and/or network elements.

The base station 114 a may be part of the RAN 104, which may alsoinclude other base stations and/or network elements (not shown), such asa base station controller (BSC), a radio network controller (RNC), relaynodes, etc. The base station 114 a and/or the base station 114 b may beconfigured to transmit and/or receive wireless signals within aparticular geographic region, which may be referred to as a cell (notshown). The cell may further be divided into cell sectors. For example,the cell associated with the base station 114 a may be divided intothree sectors. Thus, in one embodiment, the base station 114 a mayinclude three transceivers, i.e., one for each sector of the cell. Inanother embodiment, the base station 114 a may employ multiple-inputmultiple output (MIMO) technology and, therefore, may utilize multipletransceivers for each sector of the cell.

The base stations 114 a, 114 b may communicate with one or more of theWTRUs 102 a, 102 b, 102 c, 102 d over an air interface 116, which may beany suitable wireless communication link (e.g., radio frequency (RF),microwave, infrared (IR), ultraviolet (UV), visible light, etc.). Theair interface 116 may be established using any suitable radio accesstechnology (RAT).

More specifically, as noted above, the communications system 100 may bea multiple access system and may employ one or more channel accessschemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and the like. Forexample, the base station 114 a in the RAN 104 and the WTRUs 102 a, 102b, 102 c may implement a radio technology such as Universal MobileTelecommunications System (UMTS) Terrestrial Radio Access (UTRA), whichmay establish the air interface 116 using wideband CDMA (WCDMA). WCDMAmay include communication protocols such as High-Speed Packet Access(HSPA) and/or Evolved HSPA (HSPA+). HSPA may include High-Speed DownlinkPacket Access (HSDPA) and/or High-Speed Uplink Packet Access (HSUPA).

In another embodiment, the base station 114 a and the WTRUs 102 a, 102b, 102 c may implement a radio technology such as Evolved UMTSTerrestrial Radio Access (E-UTRA), which may establish the air interface116 using Long Term Evolution (LTE) and/or LTE-Advanced (LTE-A).

In other embodiments, the base station 114 a and the WTRUs 102 a, 102 b,102 c may implement radio technologies such as IEEE 802.16 (i.e.,Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000,CDMA2000 1x, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000), InterimStandard 95 (IS-95), Interim Standard 856 (IS-856), Global System forMobile communications (GSM), Enhanced Data rates for GSM Evolution(EDGE), GSM EDGE (GERAN), and the like.

The base station 114 b in FIG. 1A may be a wireless router, Home Node B,Home eNode B, or access point, for example, and may utilize any suitableRAT for facilitating wireless connectivity in a localized area, such asa place of business, a home, a vehicle, a campus, and the like. In oneembodiment, the base station 114 b and the WTRUs 102 c, 102 d mayimplement a radio technology such as IEEE 802.11 to establish a wirelesslocal area network (WLAN). In another embodiment, the base station 114 band the WTRUs 102 c, 102 d may implement a radio technology such as IEEE802.15 to establish a wireless personal area network (WPAN). In yetanother embodiment, the base station 114 b and the WTRUs 102 c, 102 dmay utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE,LTE-A, etc.) to establish a picocell or femtocell. As shown in FIG. 1A,the base station 114 b may have a direct connection to the Internet 110.Thus, the base station 114 b may not be required to access the Internet110 via the core network 106.

The RAN 104 may be in communication with the core network 106, which maybe any type of network configured to provide voice, data, applications,and/or voice over internet protocol (VoIP) services to one or more ofthe WTRUs 102 a, 102 b, 102 c, 102 d. For example, the core network 106may provide call control, billing services, mobile location-basedservices, pre-paid calling, Internet connectivity, video distribution,etc., and/or perform high-level security functions, such as userauthentication. Although not shown in FIG. 1A, it will be appreciatedthat the RAN 104 and/or the core network 106 may be in direct orindirect communication with other RANs that employ the same RAT as theRAN 104 or a different RAT. For example, in addition to being connectedto the RAN 104, which may be utilizing an E-UTRA radio technology, thecore network 106 may also be in communication with another RAN (notshown) employing a GSM radio technology.

The core network 106 may also serve as a gateway for the WTRUs 102 a,102 b, 102 c, 102 d to access the PSTN 108, the Internet 110, and/orother networks 112. The PSTN 108 may include circuit-switched telephonenetworks that provide plain old telephone service (POTS). The Internet110 may include a global system of interconnected computer networks anddevices that use common communication protocols, such as thetransmission control protocol (TCP), user datagram protocol (UDP) andthe internet protocol (IP) in the TCP/IP internet protocol suite. Thenetworks 112 may include wired or wireless communications networks ownedand/or operated by other service providers. For example, the networks112 may include another core network connected to one or more RANs,which may employ the same RAT as the RAN 104 or a different RAT.

Some or all of the WTRUs 102 a, 102 b, 102 c, 102 d in thecommunications system 100 may include multi-mode capabilities, i.e., theWTRUs 102 a, 102 b, 102 c, 102 d may include multiple transceivers forcommunicating with different wireless networks over different wirelesslinks. For example, the WTRU 102 c shown in FIG. 1A may be configured tocommunicate with the base station 114 a, which may employ acellular-based radio technology, and with the base station 114 b, whichmay employ an IEEE 802 radio technology.

FIG. 1B is a system diagram of an example WTRU 102. As shown in FIG. 1B,the WTRU 102 may include a processor 118, a transceiver 120, atransmit/receive element 122, a speaker/microphone 124, a keypad 126, adisplay/touchpad 128, non-removable memory 106, removable memory 132, apower source 134, a global positioning system (GPS) chipset 136, andother peripherals 138. It will be appreciated that the WTRU 102 mayinclude any sub-combination of the foregoing elements while remainingconsistent with an embodiment.

The processor 118 may be a general purpose processor, a special purposeprocessor, a conventional processor, a digital signal processor (DSP), aplurality of microprocessors, one or more microprocessors in associationwith a DSP core, a controller, a microcontroller, Application SpecificIntegrated Circuits (ASICs), Field Programmable Gate Array (FPGAs)circuits, any other type of integrated circuit (IC), a state machine,and the like. The processor 118 may perform signal coding, dataprocessing, power control, input/output processing, and/or any otherfunctionality that enables the WTRU 102 to operate in a wirelessenvironment. The processor 118 may be coupled to the transceiver 120,which may be coupled to the transmit/receive element 122. While FIG. 1Bdepicts the processor 118 and the transceiver 120 as separatecomponents, it will be appreciated that the processor 118 and thetransceiver 120 may be integrated together in an electronic package orchip.

The transmit/receive element 122 may be configured to transmit signalsto, or receive signals from, a base station (e.g., the base station 114a) over the air interface 116. For example, in one embodiment, thetransmit/receive element 122 may be an antenna configured to transmitand/or receive RF signals. In another embodiment, the transmit/receiveelement 122 may be an emitter/detector configured to transmit and/orreceive IR, UV, or visible light signals, for example. In yet anotherembodiment, the transmit/receive element 122 may be configured totransmit and receive both RF and light signals. It will be appreciatedthat the transmit/receive element 122 may be configured to transmitand/or receive any combination of wireless signals.

In addition, although the transmit/receive element 122 is depicted inFIG. 1B as a single element, the WTRU 102 may include any number oftransmit/receive elements 122. More specifically, the WTRU 102 mayemploy MIMO technology. Thus, in one embodiment, the WTRU 102 mayinclude two or more transmit/receive elements 122 (e.g., multipleantennas) for transmitting and receiving wireless signals over the airinterface 116.

The transceiver 120 may be configured to modulate the signals that areto be transmitted by the transmit/receive element 122 and to demodulatethe signals that are received by the transmit/receive element 122. Asnoted above, the WTRU 102 may have multi-mode capabilities. Thus, thetransceiver 120 may include multiple transceivers for enabling the WTRU102 to communicate via multiple RATs, such as UTRA and IEEE 802.11, forexample.

The processor 118 of the WTRU 102 may be coupled to, and may receiveuser input data from, the speaker/microphone 124, the keypad 126, and/orthe display/touchpad 128 (e.g., a liquid crystal display (LCD) displayunit or organic light-emitting diode (OLED) display unit). The processor118 may also output user data to the speaker/microphone 124, the keypad126, and/or the display/touchpad 128. In addition, the processor 118 mayaccess information from, and store data in, any type of suitable memory,such as the non-removable memory 106 and/or the removable memory 132.The non-removable memory 106 may include random-access memory (RAM),read-only memory (ROM), a hard disk, or any other type of memory storagedevice. The removable memory 132 may include a subscriber identitymodule (SIM) card, a memory stick, a secure digital (SD) memory card,and the like. In other embodiments, the processor 118 may accessinformation from, and store data in, memory that is not physicallylocated on the WTRU 102, such as on a server or a home computer (notshown).

The processor 118 may receive power from the power source 134, and maybe configured to distribute and/or control the power to the othercomponents in the WTRU 102. The power source 134 may be any suitabledevice for powering the WTRU 102. For example, the power source 134 mayinclude one or more dry cell batteries (e.g., nickel-cadmium (NiCd),nickel-zinc (NiZn), nickel metal hydride (NiMH), lithium-ion (Li-ion),etc.), solar cells, fuel cells, and the like.

The processor 118 may also be coupled to the GPS chipset 136, which maybe configured to provide location information (e.g., longitude andlatitude) regarding the current location of the WTRU 102. In additionto, or in lieu of, the information from the GPS chipset 136, the WTRU102 may receive location information over the air interface 116 from abase station (e.g., base stations 114 a, 114 b) and/or determine itslocation based on the timing of the signals being received from two ormore nearby base stations. It will be appreciated that the WTRU 102 mayacquire location information by way of any suitablelocation-determination method while remaining consistent with anembodiment.

The processor 118 may further be coupled to other peripherals 138, whichmay include one or more software and/or hardware modules that provideadditional features, functionality and/or wired or wirelessconnectivity. For example, the peripherals 138 may include anaccelerometer, an e-compass, a satellite transceiver, a digital camera(for photographs or video), a universal serial bus (USB) port, avibration device, a television transceiver, a hands free headset, aBluetooth® module, a frequency modulated (FM) radio unit, a digitalmusic player, a media player, a video game player module, an Internetbrowser, and the like.

FIG. 1C is a system diagram of the RAN 104 and the core network 106according to an embodiment. As noted above, the RAN 104 may employ aUTRA radio technology to communicate with the WTRUs 102 a, 102 b, 102 cover the air interface 116. The RAN 104 may also be in communicationwith the core network 106. As shown in FIG. 1C, the RAN 104 may includeNode-Bs 140 a, 140 b, 140 c, which may each include one or moretransceivers for communicating with the WTRUs 102 a, 102 b, 102 c overthe air interface 116. The Node-Bs 140 a, 140 b, 140 c may each beassociated with a particular cell (not shown) within the RAN 104. TheRAN 104 may also include RNCs 142 a, 142 b. It will be appreciated thatthe RAN 104 may include any number of Node-Bs and RNCs while remainingconsistent with an embodiment.

As shown in FIG. 1C, the Node-Bs 140 a, 140 b may be in communicationwith the RNC 142 a. Additionally, the Node-B 140 c may be incommunication with the RNC 142 b. The Node-Bs 140 a, 140 b, 140 c maycommunicate with the respective RNCs 142 a, 142 b via an Iub interface.The RNCs 142 a, 142 b may be in communication with one another via anIur interface. Each of the RNCs 142 a, 142 b may be configured tocontrol the respective Node-Bs 140 a, 140 b, 140 c to which it isconnected. In addition, each of the RNCs 142 a, 142 b may be configuredto carry out or support other functionality, such as outer loop powercontrol, load control, admission control, packet scheduling, handovercontrol, macrodiversity, security functions, data encryption, and thelike.

The core network 106 shown in FIG. 1C may include a media gateway (MGW)144, a mobile switching center (MSC) 146, a serving GPRS support node(SGSN) 148, and/or a gateway GPRS support node (GGSN) 150. While each ofthe foregoing elements are depicted as part of the core network 106, itwill be appreciated that any one of these elements may be owned and/oroperated by an entity other than the core network operator.

The RNC 142 a in the RAN 104 may be connected to the MSC 146 in the corenetwork 106 via an IuCS interface. The MSC 146 may be connected to theMGW 144. The MSC 146 and the MGW 144 may provide the WTRUs 102 a, 102 b,102 c with access to circuit-switched networks, such as the PSTN 108, tofacilitate communications between the WTRUs 102 a, 102 b, 102 c andtraditional land-line communications devices.

The RNC 142 a in the RAN 104 may also be connected to the SGSN 148 inthe core network 106 via an IuPS interface. The SGSN 148 may beconnected to the GGSN 150. The SGSN 148 and the GGSN 150 may provide theWTRUs 102 a, 102 b, 102 c with access to packet-switched networks, suchas the Internet 110, to facilitate communications between and the WTRUs102 a, 102 b, 102 c and IP-enabled devices.

As noted above, the core network 106 may also be connected to thenetworks 112, which may include other wired or wireless networks thatare owned and/or operated by other service providers.

Disclosed embodiments may introduce solutions for optimizing groupmobility procedures such as measurements, handover, cellselection/reselection procedures, as well as other group procedures likeregistration and connection establishment in idle mode and connectedmode as well. Although exemplary embodiments may be illustrated withreference to MTC devices, the disclosed concepts may be implemented withother devices, e.g., other devices that are capable of using groupmobility procedures.

Different types of UE groups may be created. For example, a predefinedgroup of MTC devices may be created. The predefined group may betogether for a predetermined or known amount of time or may be togetherindefinitely. These UEs in the predefined group may share a commonidentity or may be identified by a specific group identity.

A group may be configured by the network and be determined as part ofthe MTC registrations. Further, UEs may be pre-configured with a commongroup identity. The network may determine that the UEs are part of thesame group via one or more of the following.

The network may determine that the UEs belong to the same group if theUEs use the same identity when registering.

The MTC controller may indicate to the network existing MTC devicegroups along with the identity of each MTC device for each group.

An ad hoc group of devices may be created. The ad hoc group may existfor a temporary period of time. The network may determine that the UEsare part of the same ad hoc group via one or more of the following.

In connected mode, depending on the location and measurements reportedby the UEs, the network may determine that there is a group of UEsstaying together or moving together if it receives approximately thesame measurements for the same neighbor cells from the UEs for a certainperiod of time. When the measurements start to differ for one UE for acertain period of time or not, the network may determine that the UEleft the group.

UEs may register to master equipment and the master equipment may reportthe list of UEs belonging to the group to the network. In contrast to amacro cell, the master equipment may cover a small area which may definethe size of the group. When determining that certain UEs are part of anad hoc group, the network may provide the UE with a group identity thatmay be used to perform the procedures described herein. This does notpreclude the network from providing a UE specific identity, or toprovide an identity wherein part of the bits are common to the UEs andthe other part is unique for each UE within the group.

The network may determine that a UE belongs to a group as part of aregistration procedure. The network may be aware that certainsubscriptions and locations where the UE is located correspond to agroup.

The group procedures described herein may be applicable to other methodsof determining and configuring a group.

One or a subset of UEs may perform procedures on behalf of UEs of thesame group. The UE or UEs performing such procedures may be referred toas a special UE or special UEs (or alternately as a master UE or masterUEs). A master UE may be an instance of a special UE; a master UE may becapable of performing as a special UE and may be capable ofcommunicating with other UEs (e.g., UEs that belong to the group).

Reference may be made to solutions that are described in terms of idlemode state. However, it should be understood that at least some of theconcepts and solutions may be applicable to other states, such asconnected mode or sub-states within idle mode and connected mode.

A UE may determine that it is a special UE using one or more of thefollowing.

A pre-configuration in the device (for example in the USIM) may indicateto the device that it is a special UE.

The UE may be explicitly assigned the task of being a special UE atinitial registration, for example, via NAS signaling. This may beperformed with one or more of the following.

New IE's may be added in the NAS registration response message or a newNAS message may be defined (the NAS may notify the RRC sub-layer in thenetwork and the UE).

Assignment may be signaled at the RRC level, for example an RRC messagesent by the network to the UE after the NAS registration or IE's addedin the Downlink Direct Transfer for UMTS or DlInformationTransfer forLTE indicating to the RRC that the UE is to perform or not perform theprocedures.

A UE may be assigned a special UE identity within the group, forexample, a UE having a certain IMSI or a certain IMEI, or for instance atemporary identity assigned to the UE, or a new type of identity (e.g.,if a UE within a group is uniquely identified, a special identity suchas the first number available (e.g., 0) or any other predefined numbermay designate a special UE).

A formula may be used (e.g., a UE with special results may be the oneperforming the procedures), for example, a UE for which UE identity mod(x)=0 may be designated a special UE.

A UE may draw a Random Number between 0 and 1, where if R>X, where x isa predefined number, then the UE may be designated a special UE andperform group procedures.

The network may determine that a UE is a special UE. However, thenetwork may not need to indicate this to the UE (i.e., the UE determinedby the network to be a special UE). For example, if the procedures to befollowed by the special UE, such as the optimization proceduresdescribed herein, include procedures performed by legacy UEs, the UE maynot need to be notified that it is a special UE. The network mayconfigure the UE with a group identity that the UE may include in ULmessages when a procedure is triggered, e.g., an optimization procedureas disclosed herein.

UEs that do not meet the above mentioned criteria may not be consideredas special UEs within the group. The network may indicate to a UE thatthe UE is not a special UE and/or configure the UE to operate accordingto one or more of the optimization procedures described herein for‘non-special’ UEs. Procedures performed by a non-special UE associatedwith a group (optimization procedures) may be different from proceduresperformed by the UE when it is not associated with a group. Anoptimization procedure may modify a procedure for communication with anetwork. For example, the optimization procedures may reducetransmission overhead by reducing the amount of communication trafficsent to the network (e.g., by non-special UEs). The UE may be configuredwith a group identity in order to perform optimization procedures.

Special behavior within the group may also be configured by the networkas part of the MTC subscription. For instance, some groups may not havespecial UEs and this may be configured by the network or predefined inthe subscription.

A network may also be able to notify a change of behavior to one or moremembers of the group of UEs. For example, if a special UE leaves thearea or the connection with the special UE has been lost, the networkmay notify the other UEs that they can perform normal operation, oralternatively, assign a new special UE or UEs. This notification may beimplemented as new IE's in the paging message, or in a RRC connectionsetup or any other existing RRC message, or in a new RRC message, and,may include one or more of the following pieces of information: anindication to resume normal operations; an indication to stop normaloperations and rely on a special UE until a new notification is sent orfor a certain period of time; and, an indication that the special UE haschanged.

When a special UE leaves the group, it may notify the network via RRCsignaling. The network may notify the rest of the UEs in the group,configure a new special UE, or change the configuration of a non-specialUE. When changing the configuration of a non-special UE, the network mayindicate to the non-special UE that it is to release the optimizationprocedures, e.g., the network may indicate to the non-special UE that itis to stop performing the optimization procedures associated withnon-special UEs. If a special UE leaves the group without notifying thenetwork, the network may determine that the special UE has left byreceiving UL control message transmissions from non-special UEs or bynoticing that the special UE is no longer in the area due to the specialUE not responding to periodic triggering or lack of dedicatedconnection.

As part of the solutions disclosed herein, special UEs may be in chargeof performing one or more procedures associated with the group. Forexample, in order to limit the signaling load and battery consumptionassociated with taking measurements, a special UE may performmeasurements. When a special UE is designated to perform the proceduresassociated with the measurements, the other UEs may be precluded fromperforming those procedures.

In the case of cell reselection procedures and idle mode procedures, inorder to avoid having the UEs moving as a group send a simultaneousmessage to the network to indicate they are entering a new area or havereselected a new cell, the special UE may perform neighbor cellmeasurements on behalf of the whole group.

A special UE performing the measurements may also monitor the criteriarequired to initiate certain procedures such as cell reselection, cellupdates, location area (TA/RA) updates, RRC connection establishmentprocedures, etc. The special UE may perform the normal cellselection/reselection and area update procedures. When the criteria aremet, the special UE may initiate the procedure. For example, if cellreselection is performed, the special UE may send a cell update to thenetwork indicating the cell change. The cell reselection and cell updateprocedures may be behavior that is typical for a UE not associated witha group (e.g., a legacy UE). The UE determined by the network to be aspecial UE may not be notified that it is a special UE, allowing the UEto behave like legacy UEs.

Non-special UEs, such as UEs configured with optimization procedures,may not perform measurements of neighboring cells and may not be awarethat a change of best cell has occurred. Solutions described herein mayallow for notifying the other UEs of the change of cell. Although theprocedures described below may be described in the context of cellupdate, they may also be equally applicable to URA update and otherprocedures.

The other UEs may be notified that the change of best cell has occurredvia paging mechanisms. More specifically, when the network receives anindication of a change of area or cell from one UE or a subset of UEs inthe group, the network may page the rest of the UEs in the group overthe source cell indicating the new target cell in the paging message.The paging may be done for the group of UEs and addressed to the UEswithin this registered group simultaneously. Additionally, a new pagingcause may be introduced to allow the transmission of this information.The paging may indicate one or more of the following to the UEs: thePCI/PSC of the cell which was reselected by the special UE; the cellidentity/CGI of the cell; the location, routing, or tracking area of thecell; and, the system information required by the UE to access thetarget cell.

The paging may act as an indication for a UE indicating that a cellreselection by the special UE has taken place and/or that the paged UEshould also perform cell reselection. The behavior of the UE upon thisindication is described below. This indication may be achieved bymodifying the paging message itself, (e.g., by adding a one bitinformation or a new paging cause) or alternatively, by paging the groupover the PICH without sending a paging type 1 message. The pagingoccasion and the PI and the PF (Paging Frame) that are used for thispurpose may be determined according to the group ID, or a special PI, POand PF may be reserved for the group of UEs (it may be any of theallowed PI, PO and PF or one of the reserved bits that is used). Apaging over such occasion may be an implicit indication for thesenon-special UEs to wake for measurement purposes. A special value of theP-RNTI may be used so that the UEs can distinguish between normal pagingand this special type of paging at the MAC level.

The other UEs (e.g., non-special UEs in the group) may monitor thepaging message and when such paging indication or message is receivedover the currently camped cell, one or more of the following may beperformed.

The UE may start measurement for the target PSC/PCI explicitly providedto the UE and perform cell reselection if the cell reselection criteriato the cell are met.

The UE may reselect the indicated cell without measurements, accordingto the PSC/PCI provided in the message. The UE may initiate a reading ofthe system information in the PSC/PCI to attempt connection to the cell.Alternately, system information required for the UE to connect to thiscell may be provided in the message as well, which may speed up theconnection to the cell.

The UE may trigger initiation of measurements and the UE may ensure thatcell reselection criteria is met prior to performing cell reselection,examples may include one or more of the following.

The UE may start performing measurements to one or more than oneneighbor cells. In order to speed up the cell reselection procedure, theUE may not wait for a Treselection period that the neighbor cell isbetter than the serving cell. Cell reselection criteria may include thatone of the neighbor cells has a signal quality that may be better thanthe serving cell quality. Alternatively, a shorter Treselection may beused.

If a page to perform cell reselection without specific information isreceived, the UE may find the best cell around and reselect with orwithout waiting for Treselection.

To randomize the selection and initiation of procedures from the UE, theTreselection timer for these examples may be a maximum timer the UE mayuse. More specifically, the UE may choose a random number between 0 andTreselection to use as the actual Treselection timer to the new cell.

In an example, upon reselection to the target cell a non-special UE(i.e., a UE that belongs to the group, but is not a special UE or amaster UE) may initiate the procedure itself and send an area update(LAU/RAU/TAU) or cell update request to the network depending on the UEsmode of operation. In an example, the UE may reselect to the new cellbut not transmit a CELL UPDATE or a UL message as described herein.

A non-special UE, e.g., a UE configured to perform optimizationprocedures may perform measurements, monitor the neighboring cells, andperform normal cell reselection evaluation. When a cell reselectioncriteria is met, the UE may reselect to the new cell, acquire the systeminformation, and monitor the downlink for reception of data (e.g.,monitor a source cell for a confirmation message). The UE may notinitiate a CELL_UPDATE procedure (or other UL data, such as LAU/RAU/TAUor RRC connection request) once they have reselected to a target cell.This may allow the UE to save on UL individual requests and individualprocedure initiation. The UE may reselect the new cell and stay inreception for a configured period of time (e.g. X TTI's or X frames or Xin units of time such as ms or s). The period of time may correspond toan existing timer used for waiting of a response (e.g. in HSPA cellupdate timer T302) or a new timer used for this procedure may beconfigured. This procedure may be applicable where the UEs do notperform measurements. A page may be used as a reselection and wake upmechanism as described herein (e.g., upon a page indicating a cellreselection, the UE may reselect to the new cell according to theprocedures described herein and does not send a cell update). If the UEis in CELL_PCH, the UE may move to CELL_FACH and monitor the downlinkwithout sending a CELL UPDATE.

As an example, a non-special UE may forego sending a cell update to thenetwork when a confirmation message is received, e.g., during a certaintime period. However, the non-special UE may send a cell update to thenetwork when a confirmation message is not received, e.g., during acertain time period.

The UE may monitor the downlink for a configured period of time waitingfor a confirm message, such as a Cell Update confirm message or a RRCConnection Setup message or the NAS confirm message, over the targetcell. A pre-stored default configuration or broadcasted configurationmay be used by the UEs to be able to receive the downlink message overthe target cell or the reselected cell. The network, if it received aCELL UPDATE from a special UE, may send a confirm message addressed tothe determined group of UEs, which may wait for the message on the newreselected cell. The message sent to the UEs may be a group message,e.g., sent via a group ID, or, it may be sent individually to each UEwithin the group, e.g., within the pre-configured period of time.Alternatively, one message may be sent to all UEs comprising the commoninformation and it may include the individual information in the form ofa list, e.g., within one message. The common information may includeconfigurations for SRB's, radio bearers, transport channels, physicalchannels and other parameters common to UEs in the group. The individualinformation for each UE may include a list of individual identitiesbeing addressed, for example, a list of IMSIs, a list of new temporaryidentities like different types of RNTIs, and optionally a list of otherparameters specific to each UE may be included. A one to one mapping maybe used by the UE to figure out which specific configuration isdedicated for the UE, i.e., the UE corresponding to the first individualidentity (e.g., IMSI) in the list, may be assigned the firstconfiguration of the other lists, e.g., the first temporary identity ofthe list of RNTI's, the UE corresponding to the second individualidentity in the list would be assigned the second configuration of theother lists and so on. For each entry in the configuration list, a UEidentity may be specified so the UEs may uniquely identify theconfiguration that is applicable to the UE.

If no Confirm message is received in the DL for the configured period oftime, the UE may trigger the initiation of an uplink message, such asCELL UPDATE or RRC connection request, or a NAS message.

A similar concept may also be applicable for periodic uplink messagessuch as CELL UPDATE, URA UPDATE or LAU/TAU/RAU UPDATE. For example, a UEconfigured with this procedure, may not initiate the periodic timers(e.g. T305 for HSPA or an NAS related timer). Alternatively, theperiodic timer may be initiated, and once expired, the UE may not sendan uplink transmission. The UE monitors the downlink for a confirmmessage as described herein for a configured period of time.Alternatively, the UE may perform periodic message transmissionsregardless of its configuration.

The procedure may be finalized in the source cell. For instance, apaging may trigger the UE to wake up for reception for a configuredperiod of time, e.g. x TTI's or X frames in the source cell. A CellUpdate Confirm or an RRC Connection Setup may be sent over the sourcecell to the UEs using a common message. Or, a NAS level area updateconfirm may be sent or an individual message (e.g. CELL UPDATE) may besent to each UE. The message sent, e.g., the cell update confirm messageor setup message, may be modified such as to indicate the cell identityor the PSC/PCI of the cell for which the configuration is provided. Apre-stored default configuration or broadcasted configuration may beused by the UEs to be able to receive the downlink message. The identityof the default configuration may be sent in the paging message. Adefault configuration, including the information for setting up thesignaling radio bearers, may be broadcasted in the cell. Methods asdisclosed herein may be implemented in the event that a confirm messagehas been received.

The UEs may camp on the new cell without having received the newconfiguration and the network may page the UEs on the new cell atdifferent times, so that the UEs may connect with a new RRC connectionrequest cause and receive the configuration from the network. This maybe a way to randomize the requests.

The old cell may page the UEs at different times so that they do notmove to the new cell at the same time. In this case, the UEs maycommunicate with the new cell for the configuration when they acquirethe system information and camp on it. This way, paging on the new cellmay be avoided.

Idle mode UEs may not notify the network when a cell reselection occursin the UE. They may initiate an area update procedure when an areachange is detected. Since the special UE may not notify the network ofsuch change, the non-special UEs may not be aware of the change ofcells, e.g., if the non-special UEs do not perform normal measurements.Therefore, in order to provide this information to the other UEs, one ormore of the following may be performed.

These UEs may select a cell before starting a connection.

The UEs may monitor and measure neighboring cells, however, cellreselection rules may be updated for MTC devices. For example, thenon-special UEs may measure the serving cell and if the serving cellsignal quality and/or strength falls below a certain threshold, the UEmay search for a better cell. This threshold may be a new threshold usedfor MTC devices or the group MTC or it may be a scaling factor appliedto the existing Sintrasearch or another existing threshold. Thisthreshold may be specific to a particular class of MTC devices. Theprocedures described herein may be applicable with the modifiedmeasurement rules.

The dedicated UE or subset of UEs may notify the other UEs of the cellreselection and provide the PSC/PCI and/or cell Identity/CGI via othernon-3GPP technology, for instance Bluetooth, wireless LAN, H(e)NB, etc.Other information and behavior as described above may also be applicablefor these idle mode UEs. The difference in behavior may be that the UEswould reselect to the new cell, without sending a cell update.

The MTC device may be allowed to communicate with the other MTC devicesvia the 3GPP network. The dedicated UE may send the cell reselectioninformation to the network and the network may forward it to the rest ofthe UEs in the group via a paging message. Reselection information maybe appended to the paging message.

A Master MTC device may communicate with the UEs in the group and pagethe other UEs to reselect the cell when it detects a cell reselection isrequired. This may be a paging on the downlink over the 3GPP network,with the restriction that this page may not require the UEs to wake upand start the usual procedures associated with receiving a pagingresponse. The paging message may include PSC/PCI, cell id/CGI so thatthe UEs may directly camp on the new cell.

The master UE may stay in CELL_FACH or CELL_PCH state and may performcell updates, but other UEs in the group may stay in idle mode. Thepaging mechanism or other mechanisms described above from the sourcecell may be used to indicate to the UEs to reselect and the UEs may notneed to perform any cell update procedures. In the case of a(LAU/TAU/RAU), the UE may individually initiate the procedures, startmonitoring the downlink of the target cell within sending an UL message,and/or send a group message using any of the mechanisms provided above.

Since non-dedicated UEs in the group may not send any RRC ConnectionRequest or Cell Update when they enter a new area (LA/RA/TA) or reselecta new cell, they may not receive the response from the network, RRCConnection Setup or Cell Update Confirm, including a new configuration(radio bearers, transport channels, physical channels configuration).Exemplary solutions for sending the configuration information to thenon-dedicated UEs in the group may include one or more of the following.

The RRC Connection Request or Cell Update may be used to indicate thatthe UE entered a new area or reselected a new cell to the network, andthe network may not send any new configuration. A new cause may be addedin the RRC Connection Request or Cell Update or a new signal may bedefined. For example, the cause may be “New location for an MTC devicesgroup.”

The configuration information may be added in the paging as new IE's. Tolimit the size of the new IE's, a default configuration may be used sothat the paging message is limited to the default configuration ID.

The confirmation message from the network may be sent to the UEs in thenew cell via a group message using methods similar to the ones describedabove.

Cell selection/reselection procedures or other procedures may be updatedso that the devices moving as a group select/reselect a different cellwhen possible (e.g., when more than one neighbor cell is better than theserving cell) or reselect the same cell but not at the same time. Thismay spread the time of uplink access This may be achieved with one ormore of the following.

Each UE in the group may use a different Treselection value (time duringwhich the neighbor cell has to be better than the serving cell). Anoffset may be added or subtracted to Treselection. This offset may: behard-coded in each UE; depend on a UE unique identity like the IMSI orIMEI for example (offset may be for instance calculated as (UE UniqueIdentity) modulo (Treselection)); depend on an index assigned to each UEin the group via system information, configuration, or when manufactured(e.g., in case of metering devices staying together); and/or, be arandom number selected by the UE between a minimum and maximum value.This concept may be applicable for a scaling value ranging between aconfigured min and max value. The non-special UEs may randomly select avalue and apply it to the Treselection.

Instead of reselecting the best ranked cell, each UE in the group mayreselect the N best ranked cell. N may be determined by using one ormore of the following.

N may depend on the UE unique identity, for example, the IMSI or theIMEI. For instance, it may be calculated as (UE unique identity) modulo(number of ranked cells).

N may be a random number between 1 and a number of ranked cells.

N may depend on a value assigned to each UE in the group. This value maybe broadcasted or configured with an RRC message. It may also be hardcoded in the UE. N may be calculated for instance as (this value) modulo(number of ranked cells).

Each UE in the group may use a different offset when ranking theneighbor cells. This offset may depend on the UE unique identity likethe IMSI for example or may be a random offset.

A solution that allows the randomization of the time in which messagesare transmitted includes the possibility of spreading the time at whichthe messages or certain procedures are triggered in the RRC. Morespecifically, some RRC procedures such as CELL UPDATE for cellreselection purpose or area update (e.g., location area, routing area,or tracking area) may be triggered simultaneously by a group of UEsmoving together. In order to spread out the time at which the proceduresare triggered one or combination of the following procedures may beperformed.

An offset to the time at which the criteria is met may be introduced,for instance a Treselection timer may be extended by an offset, forexample when the criteria is met for Treselection+offset time, then theUE performs cell reselection. For other procedures, an offset may beapplied to the time in which a procedure is triggered in the UE. Theoffset may be determined by: randomly choosing a number between zero andmax configured time; the offset may correspond to a UE specific identityor a UE specific access ID (e.g., UEs within a group may be uniquelyidentified, numbered from zero to x); the offset may be determined basedon a formula based for instance on IMSI or TMSI; and/or, each UE may beconfigured with an offset during the initial registration procedure.

This offset may be used to delay the triggering of the procedure, e.g.,by waiting for the delay timer to expire after the criteria has beenmet. For example, in case of cell reselection, the criteria forreselecting to a new cell may remain that a cell remains the highestranked cell for Treselection time period, however, the triggering of theprocedures associated with cell reselection are delayed by the offsettimer. The criteria to perform the procedure may need to be met and truethroughout the offset period as well. For example, for cell reselection,the neighboring cell may need to be the highest ranked cell forTreselection+offset time period in order for the procedure to trigger.

The type of cell selection/reselection procedure to use may be indicatedby the UE with one or a combination of the following: in systeminformation, the network may indicate to the MTC devices if they shoulduse an enhanced cell selection/reselection procedure or not and whichone; and, there may be a default configuration stored in the MTC device.

The procedures described below may refer to procedures in connected modeLTE and CELL_DCH in UMTS.

Similar to the idle mode procedures, in order to limit the signalingload involved in the measurements in connected mode and/or to limit theusage of each UE battery due to neighbor cells measurements, one or asubset of UEs may perform measurements. This, in addition to methodsdescribed above, may be achieved using one or more of the following.

One or a subset of the devices in the group may perform the measurementsin connected mode, and may receive measurement configuration in ameasurement control and may send measurement reports to the network.Measurement reports and events may be sent from the UE or subset of UEstaking the measurements and detecting the events. Similar to idle modeprocedures, all UEs may take measurements and perform event evaluation,however, the non-special UEs, e.g., UEs configured with optimizationprocedures, may not send an uplink message over the source cell.

The neighbor cells to measure may be split among the devices in thegroup. For example, the network may send a different list of cells tomeasure in the measurement controls. As another example, UEs in thegroup may autonomously measure a subset of the neighbor cells list (ifit is a known group (metering devices) UEs may select a sub-listdepending on an index unique in the group).

UEs in the group may take turns to perform the measurements, which mayinclude one or more of the following.

The network dividing the UEs into subgroups and scheduling the differentgroups for measurements: the division of the UEs may be explicit (i.e.,the UEs may know that they belong to a subgroup and what subgroup itis)—the network may communicate the subgroup to the UEs either viasystem information or dedicated signaling; and/or, the network mayprovide the normal measurement configuration to the UEs expected toperform the measurements and an ‘empty’ measurement configuration to therest of the UEs.

Each subgroup of UEs may take turns for measuring the neighbor cells forN consecutive measurement occasions.

At the end of each UE or sub-group of UEs turn, the network may send anew measurement configuration to configure another UE (sub-group of UEs)to perform measurements.

The same configuration may be sent to each UE, but they may be givenpredefined times to measure, or a simplified explicit signaling may besent to each UE to stop/start performing the measurements.

The special UEs may be in charge of performing measurement andmonitoring of the criteria associated with the measurements. Whencriteria or certain measurement events are triggered, the special UE maysend a measurement report to the network. The special UEs may operatelike legacy UEs and may or may not need to be notified that they arespecial UEs. If the network makes the decision to perform a handover, itmay need to notify the other UEs associated with the same group as thespecial UE. As an example, the network may individually send handovercommands to the other UEs. The non-special UEs may monitor the downlinksource cell for a handover message or a message modifying the UE'sactive set. If the UE has been configured with an enhanced serving cellchange procedure and the target cell is in the preconfigured list ofcells, the UE may start monitoring the target cells for a handover orderor message, even though they did not send a measurement report. Similarto idle mode procedures, if a response is not received by the networkwithin a configure time, the UE may initiate a measurement report andtransmit the message in the UL.

In order to reduce the overhead associated with sending the handovercomplete message by the UE, an offset may be applied to the time withinwhich the UE is supposed to respond. The offset may be configured by thenetwork in the handover message or the UE may randomly chose a numberbetween a configure min and max value. However, in order to reduce thesignaling load during the handover, e.g., avoid sending the handoverreconfiguration message to all UEs, one or more of the following may beused.

One handover reconfiguration message may be sent to the group of UEsinstead of one handover reconfiguration message sent to each UE by usinga group identity.

One UE, or a subset of UEs, may respond to the handover request (therest of the UEs may be limited to answering in case of handover failureand not in case of success; this concept of only sending a failureanswer may be extended to other RRC messages, not just RRC messages thatinclude a reconfiguration for a handover).

If the network receives identical measurements from several devices, itmay send an enhanced handover configuration message that may add adifferent delay for the handover to each device so that each devicehands over to the new cell at a different time, and as a consequence,sends a response to the network at a different time (the network mayalso specify in the enhanced handover configuration to one or a subsetof devices that they have to send a complete, while for the rest of theUEs, they may answer in case of failure).

A group message may be sent to a number of UEs. The network may have theoption to indicate more than one UE identity in the message. The networkmay provide one common configuration and for UE specific information thenetwork may provide it in the same message with a list; for instance,the RNTIs (Radio Network Temporary Identities) may all be provided inthe same message. This may be applicable to any configuration message,including but not limited to cell update confirm, RRC connection setup,RRC connection reconfiguration, radio bearer setup/reconfiguration,transport channel reconfiguration, physical channel reconfiguration andother configuration messages. The message may include one or more of thefollowing: common information (including but not limited to SRB's, radiobearers, transport channels, physical channels information); and, UEspecific information like UE identities (a list of all the UEidentities, for instance IMSI, being addressed, a list of new temporaryidentities (e.g., RNTI), and a list of other dedicated parameters mayalso be included).

A one to one mapping may be applied, i.e., the first UE identity (e.g.,IMSI) gets a temporary identity the first temporary identity of thelist. The same mapping may be applied for the rest of the UE specificconfigurations.

Master equipment (e.g., a master UE) may be able to communicate with theUEs of a group. Master equipment may perform procedures on behalf of UEsthat the master equipment controls.

In order to manage and optimize group procedures, for example to reducethe signaling overhead or the battery consumption on certain UEs,dedicated master equipment may be in charge of performing certainprocedures on behalf of the whole group. Master equipment as used hereinmay comprise one or more devices.

As used hereinafter, master equipment may be defined as equipment whichwould perform procedures on behalf of other UEs, including but notlimited to: measurements, RRC connections establishment, networkregistration, handover procedures and/or cell selection/reselectionprocedures.

Further, master equipment may be equipment which can communicatedirectly with the UEs (e.g., as described below). Direct communicationwith the UEs may be performed over 3GPP communication or by using othernon-3GPP communication.

The master equipment may communicate with a group of UEs and with thenetwork (see FIG. 2). Examples may be special relays with limitedfunctionalities, H(e)NBs, UEs, master MTC UEs, light Node B (withlimited functionalities), etc. The master equipment may communicate withthe UEs and act as an actual cell. Some master equipment may not act asa cell, but may still be capable of communicating with other UEs. Masterequipment may be static or may be mobile (e.g., on a truck, train etc.).

The master equipment may be configured by the network explicitly ordetermined via one or a combination of the procedures disclosed herein.

In order for the group of UEs to detect the presence of and choosemaster equipment, one or more of the following may be used.

UEs belonging to a certain group may be allowed to connect to the masterequipment

A UE may detect the master as it does with other cells (e.g., closestcell).

Master equipment may have a special identity: master equipment may use acertain PSC/PCI (in this case, there may be no need to read systeminformation of master equipment); and/or, master equipment may use acertain Cell Identity of CGI (in this case, there may be a need to readsystem information of master).

A higher cell reselection priority or offset may be provided for themaster equipment for the UE to prefer this cell over connecting to adifferent cell (e.g. a macro/pico/femto cell). Optionally, the UE mayonly attempt to perform or connect to a different cell if the quality ofthe master cell goes below a threshold or if the UE no longer detectsthe master cell.

Once a UE has detected a PSC/PCI, it may try to read the systeminformation and, based on the Cell Identity/CGI included in the SI, maydetermine if it is a master.

Identities of the masters may be broadcasted by other cell—identity orPSC/PCI of master broadcasted in the (macro) cell under which the masteris located: identity of which group the master equipment belongs to maybe broadcasted; and/or, master equipment may register to the cell it islocated in so that cell may start broadcasting its identity to otherUEs.

New IE in system information of master cell may indicate that it is amaster—may be in the MIB for fast detection or SIB. A master equipmentbroadcast may be limited to a MIB, or, a MIB and one or a few SIB's.They may not need to broadcast as much information as regular cells.Minimum information may include one or more of the following.

A Boolean indicating that it is master equipment or not.

A master identity which may be a cell identity/CGI or a different typeof identity, for example, identities only used for master equipment.

A group identity to allow some UEs to register.

An indication of the type of master equipment, for example, to indicateif it is static or moving master equipment (e.g., on a train, a truck orother mobile vehicle).

The UE may be explicitly provided the information required to connect tothe master equipment or to detect the master equipment. This may beprovided in the NAS message, RRC message or any other registrationmessage. The UE may be pre-configured with this information in the USIM.

The group of UEs may be known to the master equipment with one or moreof the following.

When choosing new master equipment, UEs may have to register to themaster equipment, so the master equipment knows which UEs it may need tocommunicate with.

If it is a known group, UEs may not need to register but masterequipment is aware in advance of which UEs are in the group (e.g., formetering devices moving together). The master equipment may be notifiedvia higher layer network signaling, NAS signaling, RRC, orpre-configured in the USIM.

The network may send a list of UEs in the group it received (e.g., fromthe MTC controller) to the master equipment.

UEs may remain linked together and the group may be permanent. However,one or more UEs may leave the area (e.g., in a temporary group). One ormore of the following may be used to let the master equipment know whena UE leaves its area of control.

A UE may send a report to the network when it can no longer communicateor detect the master equipment or the quality goes below a threshold.For some configurations, this may even be a tampering/vandalism/theftreport to the network (e.g., when the UE determines that it can nolonger connect or detect it's master equipment or a special UE it mayuse it as a trigger to notify the network over a macro cell, that asecurity breach has been detected).

The UE may send a deregistering message to the old master equipment. Ifthe UE can no longer communicate with the network, the network maynotify the master equipment after receiving the report from the UE.

There may be a basic check message sent periodically by the UEs to themaster equipment.

Periodic reporting from the UEs to the master equipment may beperformed.

The master equipment may ping periodically the UEs under its control. Ifone of them does not answer, it may determine that it is not part of thegroup anymore.

The network may need to know which master equipment controls a UE. Thismay be accomplished via one or more of the following.

Master equipment may send a registration message, including the list ofUEs under its control, to the network (e.g., periodically, any time anew UE joins or leaves its group etc.).

When master equipment performs a procedure the master equipment may listthe UEs in its group.

The master equipment/UE association may be predetermined

Master equipment may perform measurements, mobility, and otherprocedures. The other UEs may remain in idle mode and not performmobility procedures. They may stay connected to the master equipment andmay be responsible for monitoring paging requests.

A UE may stay camped on the master equipment. The network may page themaster equipment if it needs to page the UE. The master equipment canforward the paging to the UEs in the group. Paging from the network maybe UE specific or group specific.

UEs may be in DRX and may need to monitor paging occasions to receive apage from master equipment. These may be the same as paging occasionsfor the network or different paging occasions. The paging occasions maybe the same among the UEs so master equipment may forward the page once.Paging occasions may be UE specific, so, if a UE specific page from thenetwork is arriving, other UEs need not receive the information. When aUE registers to master equipment, it may get a temporary group identityor temporary UE identity from which it may calculate paging occasions,or it may get paging occasions information (e.g., when to monitor),frame number of the paging occasion, and/or page indicator. A temporaryidentity or UE identity may also be received by the network.

When the master equipment receives a page from the network, it may pagethe corresponding UE or UEs under its control. The page may be a forwardof the page from the network. The master equipment may relay the page tothe UE or to the group of the UEs. The master equipment may be used tosend an indication to the UE (or UEs) via a page, using one of thetechniques disclosed herein, to tell the UE (or UEs) to wake up andconnect/select to the macro cell to receive the page.

Where master equipment forwards the paging message, the UE may performone or more of the following.

The UE may respond to the page via the master equipment.

The UE may start measuring neighbor cells and attempt to select and campon a macro cell, read system information, connect to the cell andinitiate the response to the page (e.g., for instance initiate a RRCconnection request). In order to assist the UE with the cell selection,the master equipment may provide the UE with the PSC/PCI of the macrocell the master equipment is currently connected to, or the SIB'srequired to perform the basic operations, and UE specific potentialinformation associated with the higher level location, routing, ortracking registration (this information may also be provided to the UEwhen the actual update takes place by the network). This information maybe included in the paging message that is sent by the network andforwarded by the master. This may be performed autonomously or the UEmay first tell the master cell that it is moving out of its coverage toconnect to the macro cell.

Where master equipment is in charge of notifying the UE that the networkwants to page the UE, one or more of the following may take place.

The paging indication, without a paging message, may indicate to the UEthat it is to wake up and perform cell selection to the best cell. TheUE may then send an RRC connection request to the network. The UE mayalso wait on the new cell to receive the actual paging message.

A paging message or a new message may be sent to the UE to indicate oneor more of the following: the network is attempting to connect to theUE; one bit information is provided; or the master equipment providesinformation to assist the UE in connecting to the macro cell or the cellwhich the master is connected to.

Upon reception of the page, the UE may select to the cell and may stayawake for a predetermined period of time to receive the paging messageor it may immediately initiate a RRC connection request.

The UE may notify the master equipment that the UE has received thepaging or that it has moved to a different cell. The network may notifythe master upon reception of the response.

Methods for the UEs to answer the page may include one or more of thefollowing.

UEs may respond to the master equipment and the master equipment mayforward the response. The forwarded response may: be a global responserepresenting the UEs in the group, be a response concatenating the UEsresponses, include the list of identities of the UEs and/or indicate tothe network that the UEs under master equipment control have answered(the network may be aware of which UEs are under which master equipmentcontrol).

UEs may directly respond to the network in different ways, including: aUE may select the cell and respond and/or the UE may receive the PSC/PCIof the cell in paging and respond.

When a UE has data to transmit in the UL, e.g., mobile originated data,and the UE is connected to master equipment, one or more of thefollowing may be performed in order to communicate with the network.

The UE may perform cell selection of the macro cell or a new cell andcontinue with normal solutions.

The UE may notify the master equipment that it wants to perform uplinkaccess. The master equipment may provide information to assist the UE toperform cell selection on the new cell as described herein.

The master equipment may forward the request to the network.

The network may send a connection message for the UE via the masterequipment providing handover information for the actual macro cell. Thismay also be applicable to the paging mechanisms described above.

When master equipment is used, it may be the master equipment thatperforms cell selection/reselection measurements, selects a cell andreselects a new cell when necessary, and sends area updates to thenetwork, including periodic and non-periodic area updates.

When master equipment detects that it is in a new LA/RA/RA, it may send,depending on the mode, a Cell Update (UMTS) or aLA(UMTS)/RA(UMTS)/TA(LTE) update request to the network. If in idlemode, the master equipment may first send an RRC connection request andgo through the RRC connection setup procedure before it sends a LA/RA/TAupdate request.

The message sent by the master to indicate a change of LA/RA/TA mayinclude a list of the UEs in the group (list of identities), so that thenetwork may know the UEs in the group are registering to a new area.Alternately, the message may not contain any list of UEs, since when thenetwork needs to page the UEs, it may limit its page to the master.

The network may send a confirmation or configuration message to themaster equipment including common and UE specific configuration to themaster equipment. The master equipment may forward the message to theUEs in the group. The network may also send the message directly to eachUE.

The master equipment may perform the measurements in connected mode onbehalf of the UEs in the group. The network may send measurementcontrols to the master equipment and the master equipment may sendmeasurement reports to the network.

Signaling during the handover may be reduced by performing one or moreof the following.

The network may send the reconfiguration for the handover to the masterequipment and the master equipment may forward it to the UEs in thegroup. The network may specify to the master equipment to which UEs itmay need to send the reconfiguration. One or more of the following mayapply.

The UEs in the group may answer the master equipment and: the masterequipment may send a success notification to the network if each of theUEs in the group were able to handover on the new cell; the masterequipment may indicate to the network which UEs were able tosuccessfully handover and which UEs failed; and/or the master equipmentmay indicate to the network which UEs failed (i.e., could not handoverto the new cell).

The master equipment may be used to forward reconfigurations or datacommon to all UEs in the group.

When reconfiguration or data is dedicated a single UE in the group,communication between UE and network may be used.

FIG. 2 illustrates a system with exemplary uses of master equipment tocontrol and/or communicate with a network and one or more UEs in agroup. FIG. 2 illustrates actions that take place on and/or betweendifferent equipment, e.g., UE 210 in a group of UEs, master equipment220, and network 230. For example, FIG. 2 illustrates UE 210 finding amaster equipment 220, registering with master equipment 220 andreceiving an acceptance of the registration from master equipment 220.Master equipment 220 may send a list of registered UEs to network 230and network 230 may accept the list.

FIG. 2 illustrates that master equipment 220 may perform other functionsincluding measurements and detecting a change of area. Master equipment220 may update network 230 and receive acceptance from network 230.

FIG. 2 illustrates that network 230 may communicate with UE 210 (or UEs)by using paging via master equipment 220.

What is claimed:
 1. A method for optimizing communications relating tomachine type communication devices, the method comprising: receiving, ata first user equipment (UE), an indication to operate according to anoptimization procedure, wherein the optimization procedure is configuredfor the first UE, and wherein the first UE is a member of a group ofmachine type communication devices that includes a second UE; the firstUE performing a cell reselection measurement; the first UE performingcell reselection based on the reselection measurement, when a cellreselection criteria is met; and the first UE monitoring a source cellfor a confirmation message within a time period while preventing anuplink transmission from being sent, wherein the confirmation message isbased on an uplink transmission from the second UE.
 2. The method ofclaim 1, wherein the first UE foregoes sending a cell update to thenetwork when the confirmation message is received before the time periodhas expired.
 3. The method of claim 1, wherein the first UE sends a cellupdate to the network when the confirmation message is not receivedbefore the time period has expired.
 4. A first user equipment (UE)configured, at least in part, to: receive an indication to operateaccording to an optimization procedure, wherein the optimizationprocedure is configured for the first UE, and wherein the first UE is amember of a group of machine type communication devices that includes asecond UE; perform a cell reselection measurement; perform cellreselection based on the reselection measurement, when a cellreselection criteria is met; and monitor a source cell for aconfirmation message within a time period while preventing an uplinktransmission from being sent, wherein the confirmation message is basedon an uplink transmission from the second UE.
 5. The first UE of claim4, wherein the first UE foregoes sending a cell update to the networkwhen the confirmation message is received before the time period hasexpired.
 6. The first UE of claim 4, wherein the first UE sends a cellupdate to the network when the confirmation message is not receivedbefore the time period has expired.
 7. The method of claim 1, whereinthe second UE is configured to perform an action on behalf of the groupof machine type communication devices.
 8. The first UE of claim 4,wherein the second UE is configured to perform an action on behalf ofthe group of machine type communication devices.
 9. The method of claim1, wherein the uplink transmission is a cell update or an UL message.10. The first UE of claim 4, wherein the uplink transmission is a cellupdate or an UL message.
 11. The method of claim 1, wherein the first UEis a non-special UE and the second UE is a special UE.
 12. The first UEof claim 4, wherein the first UE is a non-special UE and the second UEis a special UE.